Effect of electromagnetic stirring on improvement of solidification crack susceptibility of zirconium containing Al-Zn-Mg alloy weld - Fundamental research on solidification crack susceptibility of Al-Zn-Mg alloy weld.

福久, 松田; 一博, 中田; 建次, 塚本; 茂利, 成願

doi:10.2207/qjjws.4.120

Cited by 5 publications

(3 citation statements)

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“…In addition to the inoculation, there are also different approaches aiming to improve the weldability of aluminum alloys by using external factors. These methods, which do not require any specific filler wire production, include processes such as stirring the weld pool [97,98] and the use of pulsed current [99].…”

Section: External Factorsmentioning

confidence: 99%

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

Yolcu,

Kahraman

2023

Mater. Res. Express

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Joining aluminum alloys with arc welding methods is frequently subject to literature and industrial applications. Although aluminum alloys have different difficulties in the arc welded process, the formation and elimination of solidification cracking defects is a more complex phenomenon. Since avoidance of this defect requires specific approaches and methods, special attempts and improvements have been studied frequently on this subject in recent years. Studies in the literature have clearly shown that this defect, which is often encountered in aluminum alloys, takes place along the grain boundaries. Therefore, the major approach to eliminate this defect is activating nucleation and decreasing the grain size. In this context, modification approaches in the literature, which are frequently used for arc welding of aluminum alloys, have been developed to use three different mechanisms including heterogeneous nucleation, dendrite fragmentation, and grain detachment. While it is aimed to increase heterogeneous nucleation by reinforcing filler metals with compounds in the inoculation approach; dendrite fragmentation and grain detachment are also aimed in the approaches where external effects and forces are used. Within the frame of references, it is also possible to review the external factors aiming to improve weld pool convection and thermal conditions under two headings, which are weld pool stirring and pulsed arc current approaches. The weld pool stirring approach also includes ultrasonic treatment and magnetic arc oscillation methods. In this study, solidification cracking defect that frequently occurs in the arc welding of aluminum alloys is explained fundamentally and the attempts to eliminate this defect are presented as a review paper in a comprehensive manner.

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Section: External Factorsmentioning

confidence: 99%

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

Yolcu,

Kahraman

2023

Mater. Res. Express

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“…First detailed studies on TIG welding of aluminum alloys (1XXX, 2XXX, 5XXX) have been presented by Matsuda et al ([8], [9], [10]). It was established that fields with flux densities < 70 mT and frequencies < 20 Hz generated by coaxial coils have several beneficial effects, among which there are a significant grain refinement, an improved weld metal dilution and the suppression of pore formation.…”

Section: Application Of Magnetic Fields In Weldingmentioning

confidence: 99%

Influence of Magnetic Fields on Dilution during Laser Welding of Aluminium

Thomy

Vollertsen

2005

AMR

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In order to minimize the occurrence of hot-cracking phenomena in laser welding of hotcracking sensitive aluminum alloy sheets, it is a common technique to introduce silicon-containing filler wire into the weld metal. However, to achieve an optimum result, a homogenous distribution of not less than 2 % of silicon throughout the weld metal is strongly recommendable. Under certain circumstances, this may be a difficult task. One potential solution to achieve sufficient dilution and, consequently, a very homogenous silicon distribution might be the application of alternating magnetic fields. In foundry technology, the use of magnetic fields to influence melt flow is a wellestablished method. For TIG welding, a process called magnetic stirring was first investigated in the 1970s. It was sufficiently demonstrated by the help of an alternating magnetic field coaxial with the arc axis, that, among other effects, the degree of dilution can be increased and a refined grain structure is achieved. Since the late 1990s, some efforts have been taken to apply constant magnetic fields to laser welding processes. However, neither alternating fields nor potential effects on dilution have been in the focus of these investigations. To help this situation, basic studies on magnetically influencing melt flow during laser welding of aluminum have been conducted. To that end, alternating fields have been coaxially applied with magnetic flux densities up to 60 mT and frequencies in the range of 0 to 20 Hz. It was demonstrated by the help of a specially developed method that, depending on the parameters chosen, such fields are indeed capable of influencing melt flow and weld pool dilution, thus “stirring” the weld metal.

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“…The evaporation and diffusion of elements have an important influence on the welding process. In pulsed laser welding, Ti, B, Zr can reduce the solidification crack sensitivity of Al Zn Mg alloy [16]. Kim and Nam [17] studied the effect of transition elements Mn and Zr on the crack sensitivity of 7000 series high strength Al-Zn-Mg alloy welding, while Cu and Cr increased the crack sensitivity.…”

Section: Introductionmentioning

confidence: 99%

A review on the effect of laser pulse shaping on the microstructure and hot cracking behavior in the welding of alloys

Zhang

Jia

et al. 2021

Optics & Laser Technology

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Effect of electromagnetic stirring on improvement of solidification crack susceptibility of zirconium containing Al-Zn-Mg alloy weld - Fundamental research on solidification crack susceptibility of Al-Zn-Mg alloy weld.

Cited by 5 publications

References 0 publications

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

Influence of Magnetic Fields on Dilution during Laser Welding of Aluminium

A review on the effect of laser pulse shaping on the microstructure and hot cracking behavior in the welding of alloys

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